Heat dissipator



FIG. 1 is a perspective view of a heat dissipator showing my new design;

FIG. 2 is a front and rear view thereof;

FIG. 3 is a left and right view thereof;

FIG. 4 is a top side view thereof; and,

FIG. 5 is a bottom side view thereof. 

The ornamental design for a heat dissipator, as shown and described. 